kc3-lang/freetype/src/autofit/aflatin.h

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• Hash : 0164d934
  Author :
  Date : 2015-12-09T20:04:18
  

  [autofit] Introduce subscript top blue zones. This feature is mainly for Khmer: The idea is to avoid a clash between the top of subscript glyphs and the bottom of normal baseline glyphs. This only works for character clusters mapped to multiple glyphs. * src/autofit/afblue.dat: Add subscript top blue zone for Khmer. * src/autofit/afblue.hin (AF_BLUE_PROPERTY_LATIN_SUB_TOP): New macro. * src/autofit/afblue.c, src/autofit/afblue.h: Regenerated. * src/autofit/aflatin.h (AF_LATIN_IS_SUB_TOP_BLUE, AF_LATIN_BLUE_SUB_TOP): New macros. * src/autofit/aflatin.c (af_latin_metrics_init_blues): Handle new blue zone property. Update tracing messages. (af_latin_metrics_scale_dim): Handle new blue zone property. (af_latin_hints_compute_blue_edges): Updated.

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• src/autofit/aflatin.h

• /***************************************************************************/
  /*                                                                         */
  /*  aflatin.h                                                              */
  /*                                                                         */
  /*    Auto-fitter hinting routines for latin writing system                */
  /*    (specification).                                                     */
  /*                                                                         */
  /*  Copyright 2003-2015 by                                                 */
  /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  /*                                                                         */
  /*  This file is part of the FreeType project, and may only be used,       */
  /*  modified, and distributed under the terms of the FreeType project      */
  /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  /*  this file you indicate that you have read the license and              */
  /*  understand and accept it fully.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #ifndef __AFLATIN_H__
  #define __AFLATIN_H__
  
  #include "afhints.h"
  
  
  FT_BEGIN_HEADER
  
    /* the `latin' writing system */
  
    AF_DECLARE_WRITING_SYSTEM_CLASS( af_latin_writing_system_class )
  
  
    /* constants are given with units_per_em == 2048 in mind */
  #define AF_LATIN_CONSTANT( metrics, c )                                      \
    ( ( (c) * (FT_Long)( (AF_LatinMetrics)(metrics) )->units_per_em ) / 2048 )
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****            L A T I N   G L O B A L   M E T R I C S            *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    /*
     *  The following declarations could be embedded in the file `aflatin.c';
     *  they have been made semi-public to allow alternate writing system
     *  hinters to re-use some of them.
     */
  
  
  #define AF_LATIN_IS_TOP_BLUE( b ) \
            ( (b)->properties & AF_BLUE_PROPERTY_LATIN_TOP )
  #define AF_LATIN_IS_SUB_TOP_BLUE( b ) \
            ( (b)->properties & AF_BLUE_PROPERTY_LATIN_SUB_TOP )
  #define AF_LATIN_IS_NEUTRAL_BLUE( b ) \
            ( (b)->properties & AF_BLUE_PROPERTY_LATIN_NEUTRAL )
  #define AF_LATIN_IS_X_HEIGHT_BLUE( b ) \
            ( (b)->properties & AF_BLUE_PROPERTY_LATIN_X_HEIGHT )
  #define AF_LATIN_IS_LONG_BLUE( b ) \
            ( (b)->properties & AF_BLUE_PROPERTY_LATIN_LONG )
  
  #define AF_LATIN_MAX_WIDTHS  16
  
  
  #define AF_LATIN_BLUE_ACTIVE      ( 1U << 0 ) /* zone height is <= 3/4px   */
  #define AF_LATIN_BLUE_TOP         ( 1U << 1 ) /* we have a top blue zone   */
  #define AF_LATIN_BLUE_SUB_TOP     ( 1U << 2 ) /* we have a subscript top   */
                                                /* blue zone                 */
  #define AF_LATIN_BLUE_NEUTRAL     ( 1U << 3 ) /* we have neutral blue zone */
  #define AF_LATIN_BLUE_ADJUSTMENT  ( 1U << 4 ) /* used for scale adjustment */
                                                /* optimization              */
  
  
    typedef struct  AF_LatinBlueRec_
    {
      AF_WidthRec  ref;
      AF_WidthRec  shoot;
      FT_Pos       ascender;
      FT_Pos       descender;
      FT_UInt      flags;
  
    } AF_LatinBlueRec, *AF_LatinBlue;
  
  
    typedef struct  AF_LatinAxisRec_
    {
      FT_Fixed         scale;
      FT_Pos           delta;
  
      FT_UInt          width_count;                 /* number of used widths */
      AF_WidthRec      widths[AF_LATIN_MAX_WIDTHS]; /* widths array          */
      FT_Pos           edge_distance_threshold;   /* used for creating edges */
      FT_Pos           standard_width;         /* the default stem thickness */
      FT_Bool          extra_light;         /* is standard width very light? */
  
      /* ignored for horizontal metrics */
      FT_UInt          blue_count;
      AF_LatinBlueRec  blues[AF_BLUE_STRINGSET_MAX];
  
      FT_Fixed         org_scale;
      FT_Pos           org_delta;
  
    } AF_LatinAxisRec, *AF_LatinAxis;
  
  
    typedef struct  AF_LatinMetricsRec_
    {
      AF_StyleMetricsRec  root;
      FT_UInt             units_per_em;
      AF_LatinAxisRec     axis[AF_DIMENSION_MAX];
  
    } AF_LatinMetricsRec, *AF_LatinMetrics;
  
  
    FT_LOCAL( FT_Error )
    af_latin_metrics_init( AF_LatinMetrics  metrics,
                           FT_Face          face );
  
    FT_LOCAL( void )
    af_latin_metrics_scale( AF_LatinMetrics  metrics,
                            AF_Scaler        scaler );
  
    FT_LOCAL( void )
    af_latin_metrics_init_widths( AF_LatinMetrics  metrics,
                                  FT_Face          face );
  
    FT_LOCAL( void )
    af_latin_metrics_check_digits( AF_LatinMetrics  metrics,
                                   FT_Face          face );
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****           L A T I N   G L Y P H   A N A L Y S I S             *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
  #define AF_LATIN_HINTS_HORZ_SNAP    ( 1U << 0 ) /* stem width snapping  */
  #define AF_LATIN_HINTS_VERT_SNAP    ( 1U << 1 ) /* stem height snapping */
  #define AF_LATIN_HINTS_STEM_ADJUST  ( 1U << 2 ) /* stem width/height    */
                                                  /* adjustment           */
  #define AF_LATIN_HINTS_MONO         ( 1U << 3 ) /* monochrome rendering */
  
  
  #define AF_LATIN_HINTS_DO_HORZ_SNAP( h )             \
    AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP )
  
  #define AF_LATIN_HINTS_DO_VERT_SNAP( h )             \
    AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP )
  
  #define AF_LATIN_HINTS_DO_STEM_ADJUST( h )             \
    AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST )
  
  #define AF_LATIN_HINTS_DO_MONO( h )             \
    AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO )
  
  
    /*
     *  The next functions shouldn't normally be exported.  However, other
     *  writing systems might like to use these functions as-is.
     */
    FT_LOCAL( FT_Error )
    af_latin_hints_compute_segments( AF_GlyphHints  hints,
                                     AF_Dimension   dim );
  
    FT_LOCAL( void )
    af_latin_hints_link_segments( AF_GlyphHints  hints,
                                  FT_UInt        width_count,
                                  AF_WidthRec*   widths,
                                  AF_Dimension   dim );
  
    FT_LOCAL( FT_Error )
    af_latin_hints_compute_edges( AF_GlyphHints  hints,
                                  AF_Dimension   dim );
  
    FT_LOCAL( FT_Error )
    af_latin_hints_detect_features( AF_GlyphHints  hints,
                                    FT_UInt        width_count,
                                    AF_WidthRec*   widths,
                                    AF_Dimension   dim );
  
  /* */
  
  FT_END_HEADER
  
  #endif /* __AFLATIN_H__ */
  
  
  /* END */
  

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